feat(db): Add --restore argument to yarn db:reset

[koistya]

As a simplified database migration strategy, you can nuke and reset the database (schema and data) by using:

$ yarn db:backup [--env #0]                            # Creates a backup file (./backups/xxx_{env}.sql`)
$ yarn db:reset [--env #0] [--restore #0] [--no-seed]  # Resets database schema (and data)

...where --env is being set to local by default.

Example 1: Create a backup of the local database (data only) and reset the local db schema an data

$ yarn db:backup
$ yarn db:reset --restore      # or, yarn db:reset --restore=local

Example 2: Create a backup of the test (QA) database and restore it to the local (dev) database

$ yarn db:backup --env=test
$ yarn db:reset --restore=test